For the next two years his telegraphic work
was laid aside, if not forgotten. His success as
a teacher of deaf-mutes was sudden and overwhelming.
It was the educational sensation of
1871. It won him a professorship in Boston
University; and brought so many pupils around
him that he ventured to open an ambitious
"School of Vocal Physiology," which became at
once a profitable enterprise. For a time there
seemed to be little hope of his escaping from the
burden of this success and becoming an inventor,
when, by a most happy coincidence, two of his
pupils brought to him exactly the sort of stimulation
and practical help that he needed and had
not up to this time received.

One of these pupils was a little deaf-mute
tot, five years of age, named Georgie Sanders.
Bell had agreed to give him a series of private
lessons for $350 a year; and as the child lived
with his grandmother in the city of Salem, sixteen
miles from Boston, it was agreed that Bell should
make his home with the Sanders family. Here
he not only found the keenest interest and sympathy
in his air-castles of invention, but also was
given permission to use the cellar of the house as
his workshop.

For the next three years this cellar was his
favorite retreat. He littered it with tuning-